Big Bore Kit Install Instructions
Before installing a big bore kit, you should first install a high volume oil pump. A high volume oil pump will deliver up to 300% more oil to your top end which will only help preserve the life of your engine. To install the big bore kit you will need to:
1. Stuff a CLEAN rag behind the piston to seal off the crankcase.
2. Install a c-clip into one side of the piston. When installing the c-clip, compress the c-clip just enough to get it into the piston. Note the position of the c-clip once it is installed.
3. Install the thin retaining rings and the wavy oil ring onto the bottom of groove on the piston. Carefully slide one thin retaining ring on, then the wavy oil ring, and then the other thin retaining ring. Make sure that the gap on each ring faces the opposite direction as shown in the picture.
4. Install the lower piston ring (which is flat black in color) onto the lower groove in the piston. After the lower ring has been installed, install the upper ring, which is shiny in appearance. Note that the gap opening on each ring faces the opposite direction.
5. Lightly coat the wrist pin with clean motor oil.
6. Install the piston onto the crankshaft and secure it into place with the wrist pin. Make sure that the “IN” marking on the piston faces upwards.
7. Carefully install the second c-clip onto the piston to lock it into place. Once again, compress the c-clip just enough to secure it into the piston. Note the position of the installed c-clip.
Get pdf Big Bore Kit Install Instructions
